PHYS 152 Fall 2013
Matt Lui and Anjali Shah
Supplemental Instruction
[email protected]
SI Exam Review 1
Key Topics
Ch. 21: Electric Field and Electric Charge
●
Electric Charge Positive and negative charges. Charge is conserved. Opposites attract
●
Coulomb’s Law
○
F=
○
The force that q1 exerts on q2 is the same as the force that q2 exerts on q1,
except in the opposite direction
●
Electric Field and Forces
○
Electric field is the __________ per _______
○
E=
●
Superposition
○
affects both force and electric field
○
means that we can find the total force/electric field on a charge/certain point from
multiple charges by doing each separately, then taking the sum.
●
Using Coulomb’s Law to calculate electric field
○
Point charges
○
Distribution of charge
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Electric Field Lines
○
Always start from charge/charge distribution and go away from positive towards
negative
Ch. 22 Gauss’s Law
●
Equation:
●
Relates the electric flux through an imaginary Gaussian surface to the amount of charge
enclosed by that surface
●
Only can be used for highly symmetric situations
○
Point Charges
■
Gaussian surface:
■
A
∮
d
=
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Matt Lui and Anjali Shah
Supplemental Instruction
[email protected]
○
Infinite Lines of Charge
■
Gaussian surface:
■
A
∮
d
=
○
Infinite Planes of Charge
■
Gaussian surface:
■
A
∮
d
=
●
Some steps to get you started:
○
Break up the problem into the areas where charge enclosed differs
○
Find charge enclosed for each of those regions
■
This could involve an integral if the charge density is not a constant (i.e.
charge density =
)
r
α
■
For those situations, use q enclosed =
dV
∫
ρ
●
For spherical charge distributions:
●
For cylindrical charge distributions:
■
Make sure you set the right limits of integration!
○
Apply Gauss’s law for each of the regions where charge enclosed differs
Ch. 23 Electric Potential and Electric Potential Energy
●
The amount of electric potential energy a point charge would have at a given point
●
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 Fall '09
 JUDGE
 ANJALI SHAH, Matt Lui

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